Jemima Jones is the main character of the story. As an overweight young woman, Jemima is insecure, and sees the world in a fairly negative light. She feels invisible to most friends and family, has little social life, and can't seem to climb the corporate ladder. She also has had little dating experience. Jemima believes all of these issues are related to her weight. The friends she does have, her roommates, treat her as though she is merely a confidant, and not a real friend. Jemima seems to think the friends at work, who seem to genuinely like her, simply pity her.
When Jemima begins to lose weight, she begins to gain a social life, both online, and with her coworkers. Although she attributes this to her weight loss, it appears Jemima gains self confidence, which allows her to be more aggressive, and able to handle her relationships better. Instead of merely standing on the sidelines, Jemima gains the courage to play an active role in her life. This alone changes her, and not her weight loss. When she believes she finds love, only to be crushed, it becomes more apparent that relationships in life revolve more around emotion than physical attraction.